The nature of the nonlinear magnetoelectric effect is investigated in platelets of single-crystal Y-type hexaferrite with a collinear ferrimagnetic structure. The effect was observed at room temperature as a shift of 1.1-to-1.4 GHz in the ferromagnetic resonance frequency of Ba2Zn2Fe12O22 (Zn2Y) rectangular resonator with the application of an in-plane DC voltage. The shift amounted to 10%–12% of the central frequency which ranged from 8 to 17 GHz (X and Ku-bands). From the experimental results, we estimated the magnetoelectric modification of effective saturation magnetization and found that it scales almost linearly with the applied DC electric power. A phenomenological model for the nonlinear magnetoelectric effect, which considers the hexaferrite magnetic symmetry, is proposed and qualitatively accounts for the observed dependence of magnetic parameters on input power. It is shown that the resonator can operate as an electrically controlled discrete phase shifter with almost π / 4 phase shift and <4 dB insertion losses. These results are of importance for the use of Y-type hexaferrites in electrically tunable planar microwave signal processing devices.

中文翻译：

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Y型六铁氧体微波谐振器中的非线性磁电效应

在具有共线亚铁磁结构的单晶 Y 型六铁氧体片中研究了非线性磁电效应的性质。该效应在室温下观察到，在应用面内直流电压时，Ba2Zn2Fe12O22 (Zn2Y) 矩形谐振器的铁磁共振频率发生了 1.1 至 1.4 GHz 的偏移。偏移量达到中心频率的 10%–12%，范围从 8 到 17 GHz（X 和 Ku 波段）。根据实验结果，我们估计了有效饱和磁化强度的磁电修正，发现它与施加的直流电功率几乎成线性关系。非线性磁电效应的现象学模型，考虑了六铁氧体磁对称性，提出并定性地解释了观察到的磁参数对输入功率的依赖性。结果表明，谐振器可以作为电控分立移相器工作，具有几乎 π / 4 相移和 <4 dB 插入损耗。这些结果对于在电可调平面微波信号处理设备中使用 Y 型六铁氧体很重要。